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Every year billions of dollars and tens of thousands of productive hours are lost to network security breaches and malicious attacks. One of the critical lines of defense against such attacks is the firewall. Firewalls protect one's business assets, intellectual property and sensitive information from outside attackers, malicious software, and intentional or unintentional internal security breaches. A firewall is a security system that protects computing resources from outside intrusions, online attackers, internal threats (inside the company network), and viruses, worms, and Trojan horses. More specifically, a firewall is a hardware or software device designed to permit, deny, encrypt, decrypt or proxy computer traffic between different security domains based upon a set of rules or policies.
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